/* Webcamoid, camera capture application.
 * Copyright (C) 2025  Gonzalo Exequiel Pedone
 *
 * Webcamoid is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Webcamoid is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Webcamoid. If not, see <http://www.gnu.org/licenses/>.
 *
 * Web-Site: http://webcamoid.github.io/
 */

#ifndef AKALGORITHM_H
#define AKALGORITHM_H

#include <QtGlobal>

namespace AkAlgorithm
{
    template<typename T>
    inline T alignUp(const T &value, const T &align)
    {
        return (value + align - 1) & ~(align - 1);
    }

    inline size_t multBytesRequired(size_t nbits)
    {
        if (nbits <= 4)
            return 1;
        else if (nbits <= 8)
            return 2;
        else if (nbits <= 16)
            return 4;
        else if (nbits <= 32)
            return 8;

        return 0;
    }

    // Endianness conversion functions for color

    inline quint8 swapBytes(quint8 value)
    {
        return value;
    }

    inline quint16 swapBytes(quint16 value)
    {
        return ((value & 0xff00) >> 8)
             | ((value & 0x00ff) << 8);
    }

    inline quint32 swapBytes(quint32 value)
    {
        return ((value & 0xff000000) >> 24)
             | ((value & 0x00ff0000) >>  8)
             | ((value & 0x0000ff00) <<  8)
             | ((value & 0x000000ff) << 24);
    }

    inline quint64 swapBytes(quint64 value)
    {
        return ((value & 0xff00000000000000) >> 56)
             | ((value & 0x00ff000000000000) >> 40)
             | ((value & 0x0000ff0000000000) >> 24)
             | ((value & 0x000000ff00000000) >>  8)
             | ((value & 0x00000000ff000000) <<  8)
             | ((value & 0x0000000000ff0000) << 24)
             | ((value & 0x000000000000ff00) << 40)
             | ((value & 0x00000000000000ff) << 56);
    }

    template <typename T>
    inline void swapDataBytes(T *data, size_t sizeInBytes)
    {
        auto n = sizeInBytes / sizeof(T);

        for (size_t i = 0; i < n; ++i) {
            *data = swapBytes(static_cast<T>(*data));
            ++data;
        }
    }
}

#endif // AKALGORITHM_H
